I have experienced allergy symptoms, year round, for about a decade now. I am 21 years old. I have had my blood tested for allergies, including pet allergies, and none were identified.
The symptoms started during a summer that my family had a year pass to the local pool, and at the time I thought that it was an allergy to the pool treatment. I would experience allergy like symptoms for a couple of days after swimming. However, after that summer, if I went swimming in any type of water, I experienced allergy symptoms afterwards. I am not sure at what point the symptoms became continuous, but after it was clear that there was something more than pool treatment causing my misery, I started looking for other causes, such as pets.
Now I am at my wits end. I always have to carry a tissue with me. Some days are very mild, but never great, and other days are miserable, particularly in the morning.